ST X-NUCLEO-IHM08M1 Manuale utente

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UM1996

User manual

Getting started with X-NUCLEO-IHM08M1 low-voltage BLDC motor

driver expansion board based on STL220N6F7 for STM32 Nucleo

Introduction

The X-NUCLEO-IHM08M1 is a three-phase brushless DC motor driver expansion board based on

STripFET™ F7 Power MOSFET STL220N6F7 for STM32 Nucleo. It provides an affordable and easy-to-

use solution for driving a three-phase brushless DC motor in your STM32 Nucleo project. The X-

NUCLEO-IHM08M1 is compatible with the ST morpho connector and supports further stacking of

additional boards on a single STM32 Nucleo board. You can also mount the Arduino™ UNO R3

connector.

The X-NUCLEO-IHM08M1 is fully configurable and ready to support different closed loop control

scenarios based on sensorless or sensor mode control, and it is compatible with three-shunt or single-

shunt current sense measuring. The L6398 IC driver used on this STM32 Nucleo expansion board is a

single-chip half bridge gate driver for the N-channel power MOSFET. This combination of the L6398

gate driver and the STL220N6F7 Power MOSFET forms a high current power platform for BLDC

motors, while the digital section supported by the STM32 Nucleo board allows for a 6-step or FOC

control algorithm solution, which you can select via the firmware. This document describes how to

configure the X-NUCLEO-IHM08M1 expansion board to operate with STM32 Nucleo board.

Figure 1: X-NUCLEO-IHM08M1 low-voltage BLDC motor driver expansion board based on STL220N6F7 for

STM32 Nucleo

Contents

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Contents

1System overview ............................................................................. 5

1.1 Main characteristics ..........................................................................5

1.2 Target applications............................................................................5

2Getting started................................................................................. 6

2.1 System architecture ..........................................................................6

2.2 Building the system ...........................................................................6

2.2.1 Hardware settings............................................................................... 8

3Board schematics.......................................................................... 12

4Circuit description......................................................................... 15

4.1 Power section.................................................................................. 15

4.1.1 L6398 gate driver and STL220N6F7 STripFET™ F7 Power

MOSFET .......................................................................................................... 15

4.1.2 Overcurrent detection (OCP) and current sensing measurement.... 16

4.2 Analog section................................................................................. 17

4.2.1 Hall/Encoder motor speed sensor .................................................... 17

4.3 BEMF detection circuit .................................................................... 18

5Bill of materials.............................................................................. 19

6X-NUCLEO-IHM08M1 STM32 PMSM FOC SDK parameters ........ 27

7Revision history ............................................................................ 28

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List of tables

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List of tables

Table 1: Jumper settings ............................................................................................................................8

Table 2: Screw terminals ............................................................................................................................8

Table 3: ST morpho connector –CN7 ........................................................................................................9

Table 4: ST morpho connector –CN10 ....................................................................................................10

Table 5: BoM (1 of 2) ................................................................................................................................19

Table 6: BoM (2 of 2) ................................................................................................................................23

Table 7: Document revision history ..........................................................................................................28

List of figures

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List of figures

Figure 1: X-NUCLEO-IHM08M1 low-voltage BLDC motor driver expansion board based on

STL220N6F7 for STM32 Nucleo ................................................................................................................1

Figure 2: System functional hardware blocks .............................................................................................6

Figure 3: X-NUCLEO-IHM08M1 plugged on STM32 Nucleo board ...........................................................7

Figure 4: X-NUCLEO-IHM08M1 top layer with silk-screen.........................................................................9

Figure 5: Power section ............................................................................................................................12

Figure 6: Current sensing and B-emf circuit .............................................................................................12

Figure 7: Auxiliary power supply circuit ....................................................................................................13

Figure 8: Sensing and Hall/Encoder circuit...............................................................................................13

Figure 9: Analog conditioning and current protection circuit.....................................................................13

Figure 10: MCU pin-out assignment .........................................................................................................14

Figure 11: X-NUCLEO-IHM08M1 –power section...................................................................................16

Figure 12: X-NUCLEO-IHM08M1 –OCP circuit.......................................................................................16

Figure 13: X-NUCLEO-IHM08M1 –Current sensing circuit (1 of 3).........................................................17

Figure 14: X-NUCLEO-IHM08M1 –Current sensing circuit (2 of 3).........................................................17

Figure 15: X-NUCLEO-IHM08M1 –Current sensing circuit (3 of 3).........................................................17

Figure 16: X-NUCLEO-IHM08M1 –Hall/Encoder sensor circuit ..............................................................17

Figure 17: X-NUCLEO-IHM08M1 –BEMF detection circuit .....................................................................18

Figure 18: X-NUCLEO-IHM08M1 –VBUS and temperature sensing circuit............................................18

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System overview

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1 System overview

1.1 Main characteristics

Three-phase driver board for BLDC/PMSM motors

Nominal operating voltage range from 8 V to 48 V DC

15 ARMS output current

Operating frequency selectable by firmware

Overcurrent detection and protection (30 APEAK)

Thermal measuring and overheating protection

Full compatible with ST Six Step or ST FOC control algorithm

Full support for sensorless and sensor mode

3-shunt and 1-shunt configurable jumpers for motor current sensing

Hall / Encoder motor sensor connector and circuit

Debug connector for DAC, GPIOs, etc.

Potentiometer available for speed regulation

User LED

Compatible with STM32 Nucleo boards

Equipped with ST morpho connectors

RoHS compliant

1.2 Target applications

The target applications for the X-NUCLEO-IHM08M1 include:

Low voltage PMSM motor driver

Low power fans

Power tools

Industrial drives

Getting started

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2 Getting started

2.1 System architecture

A generic motor control system can be basically schematized as the arrangement of three

main functional blocks (see System functional hardware blocks):

Control block accepts user commands to drive a motor. The X-NUCLEO-IHM08M1 is

based on the STM32 Nucleo board, which provides all the digital signals for effective

motor driving control.

Power block is based on the 3-phase inverter topology. The core of the power block

is the embedded L6398 driver, which contains all the necessary active power and

analog components to perform low voltage PMSM motor control.

Motor the X-NUCLEO-IHM08M1 is able to proper drive a low voltage BLDC/PMSM

motor.

This section describes how to set up different hardware parts before writing and executing

an application on the STM32 Nucleo board with the low-voltage BLDC motor driver

expansion board.

Figure 2: System functional hardware blocks

2.2 Building the system

The X-NUCLEO-IHM08M1 expansion board (Power block in the figure above) is a

complete hardware development platform for the STM32 Nucleo board allowing effective

evaluation of motor control solutions for single BLDC/PMSM motors. For regular board

operation, please follow the steps below:

1. Plug the expansion board on an STM32 Nucleo main board (Control block) through

the ST morpho connector; there is only one position allowed for this connection.

Ensure that the blue (B1) and black (B2) buttons on the STM32 Nucleo board are not

covered, as shown below.

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Figure 3: X-NUCLEO-IHM08M1 plugged on STM32 Nucleo board

The interconnection between the STM32 Nucleo board and the X-NUCLEO-IHM08M1

expansion board is designed for full-compatibility with a wide range of STM32 Nucleo

boards without any solder bridge modifications, except for the removal of resistor R60 on

the NUCLEO-F401RE Nucleo board if the X-CUBE-SPN8 firmware is installed.

The stacked system is ready to operate with the connection of a BLDC/PMSM motor. For

correct use, please follow the hardware and software settings. For software details, please

refer to X-CUBE-SPN8 documentation available on www.st.com.

1. Connect the three motor wires U,V,W to the J16 connector.

2. To select the control algorithm (6-step or FOC), ensure no voltage supply is

connected.

On the STM32 NUCLEO board, set jumpers: JP1 open, JP5 (PWR) on E5V side, JP6

(IDD) closed.On the X-NUCLEO-IHM08M1 expansion board, set jumpers: J9 open,

JP3 closed.

For 6-step control (X-CUBE-SPN8 FW), set jumpers: JP1 and JP2 open, J5&J6

on the 1-Sh side. Keep capacitor C5 mounted; in case of poor motor current

regulation during startup, reduce its value.

For FOC control (STSW-STM32100 FW), set jumpers: JP1 and JP2 closed,

J5&J6 on the 3-Sh side. Remove capacitors C3, C5 and C7.

3. Connect the DC supply voltage to the J1 connector. An external power supply is

required to power up the power board and the STM32 Nucleo board. Be sure to

supply the right power for the connected motor; (e.g., max. 12V and 2A for the

BR2804 motor).

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When using a different motor rated greater than 12 V, keep jumper J9 on the

power board open before applying power-on voltage at J1 to avoid damaging the

Nucleo board. To supply the STM32-NUCLEO via usb, connect jumper JP5

between PIN 1 and PIN2. For further details on Nucleo settings, refer to UM1724

at http://www.st.com.

2.2.1 Hardware settings

By default, the X-NUCLEO-IHM08M1 provides the power supply voltage for STM32 Nucleo

board (+5V on E5V) independently through the power voltage applied at the J1 connector.

Removing resistor R170 on the expansion board, you can disconnect internal voltage

regulation and select jumper J9 to supply the STM32 Nucleo board directly from J1

connector (see Table 1: "Jumper settings") if, for instance, higher conversion efficiency is

required. For this last configuration please read the recommendation below.

Table 1: Jumper settings

Jumper

Permitted Configurations

Default

Condition

JP1

Selection for pull-up insertion (BIAS) in current sensing circuit

OPEN

JP2

Selection for operational amplifier gain modification in current sensing

circuit

OPEN

JP3

Selection for enabling pull-up in Hall/Encoder detection circuit

CLOSED

Selection to supply the STM32 Nucleo board through the X-NUCLEO-

IHM08M1.

Note: You should remove jumper J9 before power-on at J1.

Do not provide more than 12 V DC on J1 when J9 is closed or you risk

damaging the STM32 Nucleo board. Jumper JP5 on the STM32 Nucleo

board must be connected between PIN 2 and 3 to enable external

powering of the STM32 Nucleo board.

OPEN

Selection for single/three shunt configuration. It is set to single shunt by

default

1Sh

Selection for single/three shunt configuration. It is set to single shunt by

default

1Sh

Debug connector for DAC. It is available for probe connection

OPEN

Table 2: Screw terminals

Screw

Terminal

Function

Motor power supply input (8 V to 48 V)

J16

3-phase motor connector

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Figure 4: X-NUCLEO-IHM08M1 top layer with silk-screen

The X-NUCLEO-IHM08M1 power block features the ST morpho male pin header

connectors (CN7 and CN10) accessible on both sides of the board, which can be used to

connect this power board to the STM32 Nucleo board. All the MCU signal and power pins

are available on the ST morpho connector.

For further details, please refer to UM1724 document (5.12 STMicroelectronics morpho

connector) available on website www.st.com.

Table 3: ST morpho connector –CN7

Default

Signal

Solder Bridge

PC10

PC11

PC12

PD2

VDD

E5V

+5 V for STM32 Nucleo supply

R170

BOOT0

GND

NC/PF6

NC/PF7

IOREF

PA13

RESET

PA14

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